There are some scenes that I completely see and hear in my mind before I start writing—that’s inspiration. There are other scenes that are harder to put together, and those are the “rough areas” that you mentioned. I typically try to tough it out, and in doing so, I often get an “a-ha!” moment, which is also inspiration. I think that if you wait for inspiration, you’ll never get a novel finished. It’s best to tough it out and improve the more difficult scenes during revisions.